Mbms ptp and ptm channel change

Abstract

A channel type switching method for MBMS P-t-P channel and P-t-M channel comprises following steps when UE moves to a cell in DRNC and Iur interface exists: DRNC decides to perform switching between common channel and dedicated channel; DRNC notifies SRNC of MBMS channel type and common channel parameters. This invention solves the problem of MBMS channel switching process when UTE moves to a cell in DRNC and UE is receiving MBMS service under the situation that SRNC doesn't re-position while and MBMS channel type or parameter changes; it also solves the problem of MBMS channel type switching process caused by other users' movements or new services' joining in while UE doesn't move, connects with SRNC via DRNC and has on-going MBMS service.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a multimedia broadcast and multicast services, more particularly to a channel switching methods of Multimedia Broadcast and Multicast P-t-P and P-t-M channel. [0003] 2. Description of the Prior Art [0004] Multimedia Broadcast and Multicast Service (hereinafter referred to as MBMS) is new P-t-M service in 3rd generation mobile communication. The type of the channel used by MBMS can be P-t-P channel or P-t-M channel according to the number of service users. In current P-t-P service mechanism, when a user moves to a new cell, the channel used by him / her handovers from the source cell to the destination cell. Existing channel handovers are all based on P-t-P channel and the channel characteristics don't change. In MBMS service, the changing cell may result in-changes of channel characteristics. [0005] To better explain this patent, MBMS system structure is illustrated in FIG. 9. [0006] M...

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